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DOI : 10.17640/KSWST.2017.25.2.3 , Vol.25, No.2, 3 ~ 15, 2017
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| Title |
| Improvement of the Coagulation and the Nitrogen Treatment Efficiencies for the Rural Sewerage Facility(BBF-DNS) |
| 박옥현 Ok-hyun Park , 위환 Hwan Wi , 김승호 Seung-ho Kim , 공화진 Wha-jin Kong , 장길식 Gil-sik Jang , 배석진 Seok-jin Bae , 조영관 Young-gwan Cho , 김은선 Eun-sun Kim |
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| Abstract |
| In this study, small-size rural sewage treatment facility with BBF-DNS method were diagnosed treatment efficiency and investigated how to improve facilities by process. The coagulant was added to the coagulating sedimentation tank by using a stream of influent water to which sewage was pumped as a raw solution. The biofilter tank continuously was injected oxygen through the oxygen feed pump and prevented the filter pores from being blocked by the influent. In the denitrification tank, the backwash plate was reinstalled to uniformly disperse air during the backwash and the number of backwash was increased to prevent re-contamination by the sediment. The BOD of the effluent before the facility improvement was 9.2 mg/L, COD of 16.4 mg/L, SS of 15.1 mg/L, T-N of 24.289 mg/L and T-P of 1.974 mg/L, respectively. After the facility improvement, effluent BOD was 3.7 mg/L, 97.2% of the treatment efficiency compared to the influent, COD was 11.6 mg/L, 80.5%, SS was 7.2 mg/L, 95.4%, T-N 8.258 mg/L was 75.5% and T-P was 1.013 mg/L, 76.9% and all items met the effluent quality standards of the public sewage treatment facility. The nitrification rate was 32.4% and the denitrification rate was 41.1% before the facility improvement, but were improved to 76.9% and 86.2%, respectively. |
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| Key Words |
| rural sewage treatment facility, BBF-DNS, coagulation, nitrification |
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